212111221100 has 72 divisors (see below), whose sum is σ = 465088992816. Its totient is φ = 83959200000.

The previous prime is 212111221099. The next prime is 212111221117. The reversal of 212111221100 is 1122111212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23639615 + ... + 23648585.

Almost surely, 2^212111221100 is an apocalyptic number.

212111221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212111221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232544496408).

212111221100 is an abundant number, since it is smaller than the sum of its proper divisors (252977771716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212111221100 is a wasteful number, since it uses less digits than its factorization.

212111221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11427 (or 11420 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212111221100 its reverse (1122111212), we get a palindrome (213233332312).

The spelling of 212111221100 in words is "two hundred twelve billion, one hundred eleven million, two hundred twenty-one thousand, one hundred".